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The radiation mechanism of fast radio bursts (FRBs) has been extensivelystudied but still remains elusive. Coherent radiation is identified as acrucial component in the FRB mechanism, with charged bunches also playing asignificant role under specific circumstances. In the present research, wepropose a phenomenological model that draws upon the coherent curvatureradiation framework and the magnetized neutron star, taking into account thekinetic energy losses of outflow particles due to inverse Compton scattering(ICS) induced by soft photons within the magnetosphere. By integrating the ICSdeceleration mechanism for particles, we hypothesize a potential compressioneffect on the particle number density within a magnetic tube/family, whichcould facilitate achieving the necessary size for coherent radiation in theradial direction. This mechanism might potentially enable the dynamic formationof bunches capable of emitting coherent curvature radiation along the curvedmagnetic field. Moreover, we examine the formation of bunches from an energyperspective. Our discussion suggests that within the given parameter space theformation of bunches is feasible. Finally, we apply this model to FRB20190520B, one of the most active repeating FRBs discovered and monitored byFAST. Several observed phenomena are explained, including basiccharacteristics, frequency downward drifting, and bright spots within certaindynamic spectral ranges.

Fast radio bursts generated by coherent curvature radiation from compressed bunches for FRB 20190520B